study the timeline. based on fossil evidence, about how long ago did the first single - celled life form…

study the timeline. based on fossil evidence, about how long ago did the first single - celled life form appear on earth? 130 million years ago 1.5 billion years ago 2.5 billion years ago 4.1 billion years ago

study the timeline. based on fossil evidence, about how long ago did the first single - celled life form appear on earth? 130 million years ago 1.5 billion years ago 2.5 billion years ago 4.1 billion years ago

Answer

Explanation:

Step1: Identify relevant time - point

From the timeline, the first single - celled life form appears at 4.1 BYA (billion years ago).

Answer:

4.1 billion years ago